Method for storing fluoroalkene

A method for storing fluoroalkene,

• the fluoroalkene having a bromine atom or an iodine atom in a molecule,
• the method comprising:
• storing the fluoroalkene in a container, wherein
• the fluoroalkene is at least one type of fluoroethylene represented by a first general formula C2HpFqXr and, in the first general formula, X represents a bromine atom or an iodine atom, p is an integer of 0 or more and 2 or less, q is an integer of 1 or more and 3 or less, r is an integer of 1 or more and 3 or less, and p+q+r is 4, and fluoropropene represented by a second general formula C3HsFtXu and, in the second general formula, X represents a bromine atom or an iodine atom, s is an integer of 0 or more and 4 or less, t is an integer of 1 or more and 5 or less, u is an integer of 1 or more and 5 or less, and s+t+u is 6, and
• the fluoroalkene contains or does not contain at least one type among manganese, cobalt, nickel, and silicon as metal impurities, and, when any of the manganese, the cobalt, the nickel, and the silicon is contained, a total concentration of the manganese, the cobalt, the nickel, and the silicon is set to 1000 ppb by mass or less.